Flora of North America species comparison

segments not disarticulating, blue- to yellow-green, sometimes tinged maroon-purple, flattened, spatulate to broadly obovate or subcircular, thick, 5–22(–35) × 2–13.5(–16) cm, nearly smooth, papillose to puberulent (rarely glabrous);

areoles 4–16(–19) per diagonal row across midstem segment, circular to elliptic, 3–5 × 3 mm;

wool white to tan, aging gray.

0(–8) per areole, when present, usually in distal areoles, spreading, yellow, straight, acicular, 5–25 mm.

5–8(–10) per areole, best developed in distal areoles, usually reflexed, spreading or some erect in marginal areoles, red-brown (often with darker annular rings) with yellow tips, aging blackish, straight or weakly curved, not or slightly flattened near bases;

central spines 1(–2), much longer and stouter, ± acicular, 10–40 mm.

numerous, nearly filling areoles, yellow to red-brown or dark brown, to 3 mm.

crowded in crescent at adaxial edge of areole and subapical tuft, radiating and well developed in old stem segments, yellow, to 3 mm.

inner tepals pink to magenta throughout (rarely white), 25–40 mm;

filaments red-magenta (rarely pale);

anthers yellowish;

style white to pink;

stigma lobes white to cream.

inner tepals cream to lemon yellow, orangish abaxially on midvein areas, broadly spatulate-apiculate, 20–30 mm;

filaments cream-yellow;

anthers pale yellow;

style pale cream;

stigma lobes pale greenish yellow.

maturing tan, 20–40 × 15–23 mm, dry at maturity, puberulent, spineless (except in var. treleasei);

umbilicus 5–12 mm deep;

areoles 24–76.

red, subspheric, 15–28 × 12–23 mm, fleshy, glabrous, spineless;

umbilicus 4–5 mm deep;

areoles 24–36.

yellowish to tan, ± subspheric but angular, thick, 6.5–9 × 6.5–7 mm, sides smooth or bearing 1–3 depressions;

girdle protruding to 1 mm.

tan, subcircular to reniform, flattened, warped, 3–4 × 2.7–3.5 mm, 2 mm thick;

girdle protruding 0.5–0.8 mm.

= 22, 44.